Jakub,
it could be that lightdm now only display EM. But on Centos7.3 everything
worked.
I tested further and with the same setup but with GDM this works. I get
passwd expired and other messages.

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Before posting on this mailing list I posted on Lightdm mailing list but
got no response.
Does anybody know how to get hold of these guys?
Greetings, J.
2018-01-09 19:40 GMT+01:00 Jakub Hrozek <jhro...@redhat.com>:
> On Tue, Jan 09, 2018 at 12:48:39PM +0100, Johan Vermeulen wrote:
> > Hello Jakub,
> >
> > thanks for helping me out.
> >
> > It works in the console. when an expired user logs in via ctl-alt-f....
> he
> > gets all the warnings.
>
> OK, then the warnings are even passed to lightdm..
>
> Is there any chance lightdm doesn't display all PAM messages but only
> those with errors?
>